Map of mean temperatures for Earth

Click to enlarge the map. As you can see by the map, hermit crabs live in zones that range from 68F to 86F. At the extreme ends of the range these temperatures would be unsuitable and even harmful to your hermit crabs. The recommended range in your crabitat should be 75-85F. Some species *may* enjoy a higher temperature.  You can also view monthly Global Temperature and Precipitation Maps

World Temperature Map
World Temperature Map